Comment 38 for bug 542660

After tested 2 kernels, result is the same. Both lucid (and maverick) stay with black screen on startup, even after the patch, or kernel upgrade. I tried :

http://kernel.ubuntu.com/~kernel-ppa/mainline/daily/current/
and
http://kernel.ubuntu.com/~kernel-ppa/mainline/v2.6.35-rc6-maverick/

The default display is still the mini display port, not the main screen. Also, It's absolutly impossible to make the main screen reconisable by Open radeon drivers (only the screen connected to the mini display port is reconized).

the only way to get a display on main screen is :

1 - Install ubuntu using a second screen and mini display port > dvi adaptator
2 - Install proprietary ATI drivers.
3 - reboot, and unplug 2nd screen.
4 - display is now on the main screen.

There are many issues with Catalysts drivers (fresh install 10.7) Tearing (Vsync issue) is very present, and not corrected, once again. Only Open drivers really rocks, but can't can't main screen works.

Andy, if you want me to make more tests, just ask me.

Good luck